We have a jetty pipeline which is spirally welded and have 5mm tape coating on it. This like is in-piggable and its diameter is 8″. What will be the best technique that will be available. Few service providers told us that long range guided waves will work but others said its not the technique for spiral welded pipes.
Can someone through some light on the available techniques and availability in Middle East Asia?
We will need to clearly understand that LRUT is the screening tool and not precise thickness measurement tool. We need to understand the advantages and limitations of individual techniques before its selection for particular application. LRUT has its own limitations with respect to detection of smaller isolated type of defects as it considers a Cross Section Area Wall Losses. in case you are expecting general wall loss type defects then LRUT will be the right technique to go for however you will need to remove the coating at several places to install the collar. In case you have experience pit type defects in the past with no volume associated to it then you may miss few flaws while LRUT Screening. Combination of LRUT and AUT Corrosion Mapping will be the way to go for any CAT1, 2 or 3 indications as observed by LRUT.